Benzinga's Volume Movers

shares climbed 30.77 percent to $124.41. The volume of Willis Group shares traded was 3230 percent higher than normal. ACE Limited

announced its plans to buy Chubb for $28.3 billion.

surged 2.05 percent to $128.38. The volume of Towers Watson shares traded 1342 percent higher than normal. Towers Watson shares have jumped 19.03 percent over the past 52 weeks, while the S&P 500 index has gained 4.48 percent in the same period.

shares moved up 4.11 percent to $105.86. The volume of ACE traded was 1249 percent higher than normal. ACE announced its plans to buy Chubb for $28.3 billion.

shares rose 9.01 percent to $28.43. The volume of AeroVironment shares traded was 669 percent higher than normal. AeroVironment reported better-than-expected earnings for the fiscal fourth quarter on Tuesday.